Question

Are matrices A and B inverses? Look in comments to see matrices.

Answer 1

just multiply them ,if your gona get identity matrix then yes they are inverse else no

Answer 2

\[A*A^{-1}=I\]

Answer 3

What do you mean by "identity matrix"

Answer 4

identical?

Answer 5

\(\bf I = \left[
\begin{matrix}
1&0\\
0&1
\end{matrix}\right]\)

Answer 6

And for 2x2 matrices only:

\[A = \left[\begin{matrix}a & b \\ c & d\end{matrix}\right]\]

\[A^{-1} = \frac{ 1 }{ detA } \left[\begin{matrix}d & -b \\ -c & a\end{matrix}\right]\]